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Merge tag 'for-linus-20170812' of git://git.infradead.org/linux-mtd
[karo-tx-linux.git] / drivers / usb / host / xhci-pci.c
1 /*
2  * xHCI host controller driver PCI Bus Glue.
3  *
4  * Copyright (C) 2008 Intel Corp.
5  *
6  * Author: Sarah Sharp
7  * Some code borrowed from the Linux EHCI driver.
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  *
13  * This program is distributed in the hope that it will be useful, but
14  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
16  * for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software Foundation,
20  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21  */
22
23 #include <linux/pci.h>
24 #include <linux/slab.h>
25 #include <linux/module.h>
26 #include <linux/acpi.h>
27
28 #include "xhci.h"
29 #include "xhci-trace.h"
30
31 #define SSIC_PORT_NUM           2
32 #define SSIC_PORT_CFG2          0x880c
33 #define SSIC_PORT_CFG2_OFFSET   0x30
34 #define PROG_DONE               (1 << 30)
35 #define SSIC_PORT_UNUSED        (1 << 31)
36
37 /* Device for a quirk */
38 #define PCI_VENDOR_ID_FRESCO_LOGIC      0x1b73
39 #define PCI_DEVICE_ID_FRESCO_LOGIC_PDK  0x1000
40 #define PCI_DEVICE_ID_FRESCO_LOGIC_FL1009       0x1009
41 #define PCI_DEVICE_ID_FRESCO_LOGIC_FL1400       0x1400
42
43 #define PCI_VENDOR_ID_ETRON             0x1b6f
44 #define PCI_DEVICE_ID_EJ168             0x7023
45
46 #define PCI_DEVICE_ID_INTEL_LYNXPOINT_XHCI      0x8c31
47 #define PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI   0x9c31
48 #define PCI_DEVICE_ID_INTEL_WILDCATPOINT_LP_XHCI        0x9cb1
49 #define PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI             0x22b5
50 #define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_XHCI         0xa12f
51 #define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_XHCI        0x9d2f
52 #define PCI_DEVICE_ID_INTEL_BROXTON_M_XHCI              0x0aa8
53 #define PCI_DEVICE_ID_INTEL_BROXTON_B_XHCI              0x1aa8
54 #define PCI_DEVICE_ID_INTEL_APL_XHCI                    0x5aa8
55 #define PCI_DEVICE_ID_INTEL_DNV_XHCI                    0x19d0
56
57 #define PCI_DEVICE_ID_AMD_PROMONTORYA_4                 0x43b9
58 #define PCI_DEVICE_ID_AMD_PROMONTORYA_3                 0x43ba
59 #define PCI_DEVICE_ID_AMD_PROMONTORYA_2                 0x43bb
60 #define PCI_DEVICE_ID_AMD_PROMONTORYA_1                 0x43bc
61
62 #define PCI_DEVICE_ID_ASMEDIA_1042A_XHCI                0x1142
63
64 static const char hcd_name[] = "xhci_hcd";
65
66 static struct hc_driver __read_mostly xhci_pci_hc_driver;
67
68 static int xhci_pci_setup(struct usb_hcd *hcd);
69
70 static const struct xhci_driver_overrides xhci_pci_overrides __initconst = {
71         .reset = xhci_pci_setup,
72 };
73
74 /* called after powerup, by probe or system-pm "wakeup" */
75 static int xhci_pci_reinit(struct xhci_hcd *xhci, struct pci_dev *pdev)
76 {
77         /*
78          * TODO: Implement finding debug ports later.
79          * TODO: see if there are any quirks that need to be added to handle
80          * new extended capabilities.
81          */
82
83         /* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
84         if (!pci_set_mwi(pdev))
85                 xhci_dbg(xhci, "MWI active\n");
86
87         xhci_dbg(xhci, "Finished xhci_pci_reinit\n");
88         return 0;
89 }
90
91 static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
92 {
93         struct pci_dev          *pdev = to_pci_dev(dev);
94
95         /* Look for vendor-specific quirks */
96         if (pdev->vendor == PCI_VENDOR_ID_FRESCO_LOGIC &&
97                         (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK ||
98                          pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_FL1400)) {
99                 if (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK &&
100                                 pdev->revision == 0x0) {
101                         xhci->quirks |= XHCI_RESET_EP_QUIRK;
102                         xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
103                                 "QUIRK: Fresco Logic xHC needs configure"
104                                 " endpoint cmd after reset endpoint");
105                 }
106                 if (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK &&
107                                 pdev->revision == 0x4) {
108                         xhci->quirks |= XHCI_SLOW_SUSPEND;
109                         xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
110                                 "QUIRK: Fresco Logic xHC revision %u"
111                                 "must be suspended extra slowly",
112                                 pdev->revision);
113                 }
114                 if (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK)
115                         xhci->quirks |= XHCI_BROKEN_STREAMS;
116                 /* Fresco Logic confirms: all revisions of this chip do not
117                  * support MSI, even though some of them claim to in their PCI
118                  * capabilities.
119                  */
120                 xhci->quirks |= XHCI_BROKEN_MSI;
121                 xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
122                                 "QUIRK: Fresco Logic revision %u "
123                                 "has broken MSI implementation",
124                                 pdev->revision);
125                 xhci->quirks |= XHCI_TRUST_TX_LENGTH;
126         }
127
128         if (pdev->vendor == PCI_VENDOR_ID_FRESCO_LOGIC &&
129                         pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_FL1009)
130                 xhci->quirks |= XHCI_BROKEN_STREAMS;
131
132         if (pdev->vendor == PCI_VENDOR_ID_NEC)
133                 xhci->quirks |= XHCI_NEC_HOST;
134
135         if (pdev->vendor == PCI_VENDOR_ID_AMD && xhci->hci_version == 0x96)
136                 xhci->quirks |= XHCI_AMD_0x96_HOST;
137
138         /* AMD PLL quirk */
139         if (pdev->vendor == PCI_VENDOR_ID_AMD && usb_amd_find_chipset_info())
140                 xhci->quirks |= XHCI_AMD_PLL_FIX;
141
142         if (pdev->vendor == PCI_VENDOR_ID_AMD)
143                 xhci->quirks |= XHCI_TRUST_TX_LENGTH;
144
145         if ((pdev->vendor == PCI_VENDOR_ID_AMD) &&
146                 ((pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_4) ||
147                 (pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_3) ||
148                 (pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_2) ||
149                 (pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_1)))
150                 xhci->quirks |= XHCI_U2_DISABLE_WAKE;
151
152         if (pdev->vendor == PCI_VENDOR_ID_INTEL) {
153                 xhci->quirks |= XHCI_LPM_SUPPORT;
154                 xhci->quirks |= XHCI_INTEL_HOST;
155                 xhci->quirks |= XHCI_AVOID_BEI;
156         }
157         if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
158                         pdev->device == PCI_DEVICE_ID_INTEL_PANTHERPOINT_XHCI) {
159                 xhci->quirks |= XHCI_EP_LIMIT_QUIRK;
160                 xhci->limit_active_eps = 64;
161                 xhci->quirks |= XHCI_SW_BW_CHECKING;
162                 /*
163                  * PPT desktop boards DH77EB and DH77DF will power back on after
164                  * a few seconds of being shutdown.  The fix for this is to
165                  * switch the ports from xHCI to EHCI on shutdown.  We can't use
166                  * DMI information to find those particular boards (since each
167                  * vendor will change the board name), so we have to key off all
168                  * PPT chipsets.
169                  */
170                 xhci->quirks |= XHCI_SPURIOUS_REBOOT;
171         }
172         if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
173                 (pdev->device == PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI ||
174                  pdev->device == PCI_DEVICE_ID_INTEL_WILDCATPOINT_LP_XHCI)) {
175                 xhci->quirks |= XHCI_SPURIOUS_REBOOT;
176                 xhci->quirks |= XHCI_SPURIOUS_WAKEUP;
177         }
178         if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
179                 (pdev->device == PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_XHCI ||
180                  pdev->device == PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_XHCI ||
181                  pdev->device == PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI ||
182                  pdev->device == PCI_DEVICE_ID_INTEL_BROXTON_M_XHCI ||
183                  pdev->device == PCI_DEVICE_ID_INTEL_BROXTON_B_XHCI ||
184                  pdev->device == PCI_DEVICE_ID_INTEL_APL_XHCI ||
185                  pdev->device == PCI_DEVICE_ID_INTEL_DNV_XHCI)) {
186                 xhci->quirks |= XHCI_PME_STUCK_QUIRK;
187         }
188         if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
189                  pdev->device == PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI) {
190                 xhci->quirks |= XHCI_SSIC_PORT_UNUSED;
191         }
192         if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
193             (pdev->device == PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI ||
194              pdev->device == PCI_DEVICE_ID_INTEL_APL_XHCI ||
195              pdev->device == PCI_DEVICE_ID_INTEL_DNV_XHCI))
196                 xhci->quirks |= XHCI_MISSING_CAS;
197
198         if (pdev->vendor == PCI_VENDOR_ID_ETRON &&
199                         pdev->device == PCI_DEVICE_ID_EJ168) {
200                 xhci->quirks |= XHCI_RESET_ON_RESUME;
201                 xhci->quirks |= XHCI_TRUST_TX_LENGTH;
202                 xhci->quirks |= XHCI_BROKEN_STREAMS;
203         }
204         if (pdev->vendor == PCI_VENDOR_ID_RENESAS &&
205                         pdev->device == 0x0015)
206                 xhci->quirks |= XHCI_RESET_ON_RESUME;
207         if (pdev->vendor == PCI_VENDOR_ID_VIA)
208                 xhci->quirks |= XHCI_RESET_ON_RESUME;
209
210         /* See https://bugzilla.kernel.org/show_bug.cgi?id=79511 */
211         if (pdev->vendor == PCI_VENDOR_ID_VIA &&
212                         pdev->device == 0x3432)
213                 xhci->quirks |= XHCI_BROKEN_STREAMS;
214
215         if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
216                         pdev->device == 0x1042)
217                 xhci->quirks |= XHCI_BROKEN_STREAMS;
218         if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
219                         pdev->device == 0x1142)
220                 xhci->quirks |= XHCI_TRUST_TX_LENGTH;
221
222         if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
223                 pdev->device == PCI_DEVICE_ID_ASMEDIA_1042A_XHCI)
224                 xhci->quirks |= XHCI_ASMEDIA_MODIFY_FLOWCONTROL;
225
226         if (pdev->vendor == PCI_VENDOR_ID_TI && pdev->device == 0x8241)
227                 xhci->quirks |= XHCI_LIMIT_ENDPOINT_INTERVAL_7;
228
229         if (xhci->quirks & XHCI_RESET_ON_RESUME)
230                 xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
231                                 "QUIRK: Resetting on resume");
232 }
233
234 #ifdef CONFIG_ACPI
235 static void xhci_pme_acpi_rtd3_enable(struct pci_dev *dev)
236 {
237         static const guid_t intel_dsm_guid =
238                 GUID_INIT(0xac340cb7, 0xe901, 0x45bf,
239                           0xb7, 0xe6, 0x2b, 0x34, 0xec, 0x93, 0x1e, 0x23);
240         union acpi_object *obj;
241
242         obj = acpi_evaluate_dsm(ACPI_HANDLE(&dev->dev), &intel_dsm_guid, 3, 1,
243                                 NULL);
244         ACPI_FREE(obj);
245 }
246 #else
247 static void xhci_pme_acpi_rtd3_enable(struct pci_dev *dev) { }
248 #endif /* CONFIG_ACPI */
249
250 /* called during probe() after chip reset completes */
251 static int xhci_pci_setup(struct usb_hcd *hcd)
252 {
253         struct xhci_hcd         *xhci;
254         struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
255         int                     retval;
256
257         xhci = hcd_to_xhci(hcd);
258         if (!xhci->sbrn)
259                 pci_read_config_byte(pdev, XHCI_SBRN_OFFSET, &xhci->sbrn);
260
261         retval = xhci_gen_setup(hcd, xhci_pci_quirks);
262         if (retval)
263                 return retval;
264
265         if (!usb_hcd_is_primary_hcd(hcd))
266                 return 0;
267
268         xhci_dbg(xhci, "Got SBRN %u\n", (unsigned int) xhci->sbrn);
269
270         /* Find any debug ports */
271         return xhci_pci_reinit(xhci, pdev);
272 }
273
274 /*
275  * We need to register our own PCI probe function (instead of the USB core's
276  * function) in order to create a second roothub under xHCI.
277  */
278 static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
279 {
280         int retval;
281         struct xhci_hcd *xhci;
282         struct hc_driver *driver;
283         struct usb_hcd *hcd;
284
285         driver = (struct hc_driver *)id->driver_data;
286
287         /* For some HW implementation, a XHCI reset is just not enough... */
288         if (usb_xhci_needs_pci_reset(dev)) {
289                 dev_info(&dev->dev, "Resetting\n");
290                 if (pci_reset_function_locked(dev))
291                         dev_warn(&dev->dev, "Reset failed");
292         }
293
294         /* Prevent runtime suspending between USB-2 and USB-3 initialization */
295         pm_runtime_get_noresume(&dev->dev);
296
297         /* Register the USB 2.0 roothub.
298          * FIXME: USB core must know to register the USB 2.0 roothub first.
299          * This is sort of silly, because we could just set the HCD driver flags
300          * to say USB 2.0, but I'm not sure what the implications would be in
301          * the other parts of the HCD code.
302          */
303         retval = usb_hcd_pci_probe(dev, id);
304
305         if (retval)
306                 goto put_runtime_pm;
307
308         /* USB 2.0 roothub is stored in the PCI device now. */
309         hcd = dev_get_drvdata(&dev->dev);
310         xhci = hcd_to_xhci(hcd);
311         xhci->shared_hcd = usb_create_shared_hcd(driver, &dev->dev,
312                                 pci_name(dev), hcd);
313         if (!xhci->shared_hcd) {
314                 retval = -ENOMEM;
315                 goto dealloc_usb2_hcd;
316         }
317
318         retval = usb_add_hcd(xhci->shared_hcd, dev->irq,
319                         IRQF_SHARED);
320         if (retval)
321                 goto put_usb3_hcd;
322         /* Roothub already marked as USB 3.0 speed */
323
324         if (!(xhci->quirks & XHCI_BROKEN_STREAMS) &&
325                         HCC_MAX_PSA(xhci->hcc_params) >= 4)
326                 xhci->shared_hcd->can_do_streams = 1;
327
328         if (xhci->quirks & XHCI_PME_STUCK_QUIRK)
329                 xhci_pme_acpi_rtd3_enable(dev);
330
331         /* USB-2 and USB-3 roothubs initialized, allow runtime pm suspend */
332         pm_runtime_put_noidle(&dev->dev);
333
334         return 0;
335
336 put_usb3_hcd:
337         usb_put_hcd(xhci->shared_hcd);
338 dealloc_usb2_hcd:
339         usb_hcd_pci_remove(dev);
340 put_runtime_pm:
341         pm_runtime_put_noidle(&dev->dev);
342         return retval;
343 }
344
345 static void xhci_pci_remove(struct pci_dev *dev)
346 {
347         struct xhci_hcd *xhci;
348
349         xhci = hcd_to_xhci(pci_get_drvdata(dev));
350         xhci->xhc_state |= XHCI_STATE_REMOVING;
351         if (xhci->shared_hcd) {
352                 usb_remove_hcd(xhci->shared_hcd);
353                 usb_put_hcd(xhci->shared_hcd);
354         }
355
356         /* Workaround for spurious wakeups at shutdown with HSW */
357         if (xhci->quirks & XHCI_SPURIOUS_WAKEUP)
358                 pci_set_power_state(dev, PCI_D3hot);
359
360         usb_hcd_pci_remove(dev);
361 }
362
363 #ifdef CONFIG_PM
364 /*
365  * In some Intel xHCI controllers, in order to get D3 working,
366  * through a vendor specific SSIC CONFIG register at offset 0x883c,
367  * SSIC PORT need to be marked as "unused" before putting xHCI
368  * into D3. After D3 exit, the SSIC port need to be marked as "used".
369  * Without this change, xHCI might not enter D3 state.
370  */
371 static void xhci_ssic_port_unused_quirk(struct usb_hcd *hcd, bool suspend)
372 {
373         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
374         u32 val;
375         void __iomem *reg;
376         int i;
377
378         for (i = 0; i < SSIC_PORT_NUM; i++) {
379                 reg = (void __iomem *) xhci->cap_regs +
380                                 SSIC_PORT_CFG2 +
381                                 i * SSIC_PORT_CFG2_OFFSET;
382
383                 /* Notify SSIC that SSIC profile programming is not done. */
384                 val = readl(reg) & ~PROG_DONE;
385                 writel(val, reg);
386
387                 /* Mark SSIC port as unused(suspend) or used(resume) */
388                 val = readl(reg);
389                 if (suspend)
390                         val |= SSIC_PORT_UNUSED;
391                 else
392                         val &= ~SSIC_PORT_UNUSED;
393                 writel(val, reg);
394
395                 /* Notify SSIC that SSIC profile programming is done */
396                 val = readl(reg) | PROG_DONE;
397                 writel(val, reg);
398                 readl(reg);
399         }
400 }
401
402 /*
403  * Make sure PME works on some Intel xHCI controllers by writing 1 to clear
404  * the Internal PME flag bit in vendor specific PMCTRL register at offset 0x80a4
405  */
406 static void xhci_pme_quirk(struct usb_hcd *hcd)
407 {
408         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
409         void __iomem *reg;
410         u32 val;
411
412         reg = (void __iomem *) xhci->cap_regs + 0x80a4;
413         val = readl(reg);
414         writel(val | BIT(28), reg);
415         readl(reg);
416 }
417
418 static int xhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
419 {
420         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
421         struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
422         int                     ret;
423
424         /*
425          * Systems with the TI redriver that loses port status change events
426          * need to have the registers polled during D3, so avoid D3cold.
427          */
428         if (xhci->quirks & XHCI_COMP_MODE_QUIRK)
429                 pci_d3cold_disable(pdev);
430
431         if (xhci->quirks & XHCI_PME_STUCK_QUIRK)
432                 xhci_pme_quirk(hcd);
433
434         if (xhci->quirks & XHCI_SSIC_PORT_UNUSED)
435                 xhci_ssic_port_unused_quirk(hcd, true);
436
437         ret = xhci_suspend(xhci, do_wakeup);
438         if (ret && (xhci->quirks & XHCI_SSIC_PORT_UNUSED))
439                 xhci_ssic_port_unused_quirk(hcd, false);
440
441         return ret;
442 }
443
444 static int xhci_pci_resume(struct usb_hcd *hcd, bool hibernated)
445 {
446         struct xhci_hcd         *xhci = hcd_to_xhci(hcd);
447         struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
448         int                     retval = 0;
449
450         /* The BIOS on systems with the Intel Panther Point chipset may or may
451          * not support xHCI natively.  That means that during system resume, it
452          * may switch the ports back to EHCI so that users can use their
453          * keyboard to select a kernel from GRUB after resume from hibernate.
454          *
455          * The BIOS is supposed to remember whether the OS had xHCI ports
456          * enabled before resume, and switch the ports back to xHCI when the
457          * BIOS/OS semaphore is written, but we all know we can't trust BIOS
458          * writers.
459          *
460          * Unconditionally switch the ports back to xHCI after a system resume.
461          * It should not matter whether the EHCI or xHCI controller is
462          * resumed first. It's enough to do the switchover in xHCI because
463          * USB core won't notice anything as the hub driver doesn't start
464          * running again until after all the devices (including both EHCI and
465          * xHCI host controllers) have been resumed.
466          */
467
468         if (pdev->vendor == PCI_VENDOR_ID_INTEL)
469                 usb_enable_intel_xhci_ports(pdev);
470
471         if (xhci->quirks & XHCI_SSIC_PORT_UNUSED)
472                 xhci_ssic_port_unused_quirk(hcd, false);
473
474         if (xhci->quirks & XHCI_PME_STUCK_QUIRK)
475                 xhci_pme_quirk(hcd);
476
477         retval = xhci_resume(xhci, hibernated);
478         return retval;
479 }
480 #endif /* CONFIG_PM */
481
482 /*-------------------------------------------------------------------------*/
483
484 /* PCI driver selection metadata; PCI hotplugging uses this */
485 static const struct pci_device_id pci_ids[] = { {
486         /* handle any USB 3.0 xHCI controller */
487         PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_XHCI, ~0),
488         .driver_data =  (unsigned long) &xhci_pci_hc_driver,
489         },
490         { /* end: all zeroes */ }
491 };
492 MODULE_DEVICE_TABLE(pci, pci_ids);
493
494 /* pci driver glue; this is a "new style" PCI driver module */
495 static struct pci_driver xhci_pci_driver = {
496         .name =         (char *) hcd_name,
497         .id_table =     pci_ids,
498
499         .probe =        xhci_pci_probe,
500         .remove =       xhci_pci_remove,
501         /* suspend and resume implemented later */
502
503         .shutdown =     usb_hcd_pci_shutdown,
504 #ifdef CONFIG_PM
505         .driver = {
506                 .pm = &usb_hcd_pci_pm_ops
507         },
508 #endif
509 };
510
511 static int __init xhci_pci_init(void)
512 {
513         xhci_init_driver(&xhci_pci_hc_driver, &xhci_pci_overrides);
514 #ifdef CONFIG_PM
515         xhci_pci_hc_driver.pci_suspend = xhci_pci_suspend;
516         xhci_pci_hc_driver.pci_resume = xhci_pci_resume;
517 #endif
518         return pci_register_driver(&xhci_pci_driver);
519 }
520 module_init(xhci_pci_init);
521
522 static void __exit xhci_pci_exit(void)
523 {
524         pci_unregister_driver(&xhci_pci_driver);
525 }
526 module_exit(xhci_pci_exit);
527
528 MODULE_DESCRIPTION("xHCI PCI Host Controller Driver");
529 MODULE_LICENSE("GPL");